body{
    margin: auto;
}
a.a1:hover {color: white;}
.a1{
    text-decoration: none;
    color: #b0b0b0;
    font-size: 12px;
}
a.a2:hover {color: orange;}
.a2{
    text-decoration: none;
    color: black;
    font-size: 12px;
}
.span1{
    color: #b0b0b0;
}
.container{
    background-color: rgb(51,51,51);
}
.back{
    margin-left: 150px;
    height: 460px;
    width: 1226px;
    background-size: cover;
    background-image: url("背景.jpg");
}

.div1{
    display: inline-block;
    width: 700px;
    height: 40px;
    background-color: rgb(51,51,51);
    line-height: 40px;
    padding-left: 150px;
}
.div2{
    display: inline-block;
    width: 60px;
    height: 40px;
    background-color: rgb(51,51,51);
    line-height: 40px;
    margin-left: 5px;
    text-align: center;
}
.div3{
    display: inline-block;
    width: 140px;
    height: 40px;
    background-color: rgb(51,51,51);
    line-height: 40px;
    margin-left: 400px;
    text-align: center;
}
ul,li{
    list-style: none;
    color: white;
    height: 46px;
    opacity: 1;
}
